<template>
  <div>
    <!--面包屑导航-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <!--提示区-->
      <el-alert title="添加商品信息" type="info" center show-icon :closable=false></el-alert>
      <!--步骤条-->
      <!--activeIndex - 0 将字符串转换为数字-->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!--tab栏区域-->
      <!--v-model绑定的值是name对应的值-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model=addForm.goods_name></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model=addForm.goods_price type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model=addForm.goods_weight type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model=addForm.goods_number type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!--v-model绑定的是选中的商品分类-->
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!--复选框组 v-model绑定的是需要渲染的数组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!--action 表示图片要上传的后台api on-preview表示预览时的事件 on-remove表示移除图片触发的事件 上传文件必须手动指定请求头-->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!--富文本编辑器-->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!--添加商品的按钮-->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!--图片预览-->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%"
      :before-close="handleClose">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>

import _ from 'lodash';

export default {
  name: "Add",
  data() {
    return {
      activeIndex: "0",
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: [],
      },
      // 添加商品的表单验证规则
      addFormRules: {
        goods_name: [
          {required: true, message: '请输入商品名称', trigger: 'blur'}
        ],
        goods_price: [
          {required: true, message: '请输入商品价格', trigger: 'blur'}
        ],
        goods_weight: [
          {required: true, message: '请输入商品重量', trigger: 'blur'}
        ],
        goods_number: [
          {required: true, message: '请输入商品数量', trigger: 'blur'}
        ],
        goods_cat: [
          {required: true, message: '请选择商品分类', trigger: 'blur'}
        ],
      },
      // 商品分类数据列表
      cateList: [],
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态参数列表数据
      onlyTableData: [],
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的header请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false,
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const {data: res} = await this.$http.get('categories');
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品数据分类失败')
      }
      this.cateList = res.data;
      console.log(this.cateList);
    },
    // 级联选择器改变时,会触发的函数
    handleChange() {
      console.log(this.addForm.goods_cat);
      // 判断选择范围,必须选择第三级菜单才给显示
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      // console.log(`即将离开的标签页名称是${oldActiveName}`)
      // console.log(`即将进入的标签页名称是${activeName}`)
      // return false
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false;
      }
    },
    async tabClicked() {
      console.log(this.activeIndex)
      // 访问的是动态参数面板
      if (this.activeIndex === '1') {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'many'}})
        if (res.meta.status !== 200) {
          return this.$message.error('获取用户列表失败')
        }
        console.log(res.data);
        res.data.forEach(item => {
          // 将attr_vals以空格分割为数组
          item.attr_vals = item.attr_vals.length !== 0 ? item.attr_vals.split(' ') : []
        })
        this.manyTableData = res.data;
      } else if (this.activeIndex === '2') {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'only'}})
        if (res.meta.status !== 200) {
          return this.$message.error('获取用户列表失败')
        }
        console.log(res.data)
        this.onlyTableData = res.data;
      }
    },
    // 处理图片预览
    handlePreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    // 处理移除图片的逻辑
    handleRemove(file) {
      console.log(file);
      // 找到移除文件的临时路径
      const filePath = file.response.data.tmp_path
      // 利用图片的临时路径找到对应文件的索引
      const index = this.addForm.pics.findIndex(item => item.pic === filePath)
      // 根据索引号删除对应的文件临时路径
      this.addForm.pics.splice(index, 1);
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      console.log(response) // object
      // 拼接得到一个图片信息对象
      const picInfo = {pic: response.data.tmp_path}
      this.addForm.pics.push(picInfo)
      console.log(this.addForm);
    },
    handleClose() {

    },
    add() {
      // console.log(this.addForm);
      this.$refs.addFormRef.validate(valid => {
        if(!valid) return this.$message.error('请填写必要的表单项');
        // 执行添加的业务逻辑
        // 后台api要求goods_cat必须为字符串，但是级联选择器中必须引用数组，所以可以深拷贝对象
        // 使用ladash中的cloneDeep函数即可操作
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(',');
        // 处理动态属性
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          };
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs;
        console.log(form)
        // 发起请求添加商品
        const result = this.$http.post('goods', form);
        result.then(res => {
          if(res.data.meta.status !== 201) {
            return this.$message.error('添加商品失败');
          }
          this.$message.success('添加商品成功');
          this.$router.push('/goods');
        })
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped>
.el-checkbox {
  margin-right: 10px !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>